Carburetor



SePt- 13 1927 A. E. WEAVER CARBURETOR Filed Sept. 5,' 1921 2 Sheets-Sheet l H www@ E wpa/wrox lbertEWeaz/er y 1,642,097l SGP@ 13 i927" A. E. WEAVER CARBURETOR .Filed sept.y s, 1921 2 sheets-sneer 2 gr/Benton' Alberi EWeaver Patented Sept. 13, 1927.

UNITED STATES PATENT OFFICE;-

.ALBERT E. WEAVERV F INDIANAPOLIS,INDIANA, ASSIQNOB, BY MESNE ASSIGN- MENTS, T0 IBA T. SWABTZ, TRUSTEE, 0F INDIANAPOLIS, INDIANA.

CABBURETOR.

A'ppIioation-led September 3.1921. Serial No. 498,336.

This invention relates to carburetors, and the prime feature of the invention is the'pro vision of means for controlling thev admission of air into the carburetor and causing the same to` commingle with the fuel in proper proportion. l

A further feature of the invention is the provision of a movable venturi adapted to be automatically positioned for controlling the admission of air in accordance with the speed or running condition of the engine. y

A further feature of the invention is theprovision of means for adjusting or limit ing the movement of the venturi.

A further feature of the invention is the provision of means for conveying air into the fuel chamber of the carburetor for aerating and agitating the fuel and for controlling the float when anK excessive vacuum is created in the upper' portion of the carburetor. l

Other objects and advantages will be hereinafter more fully set vforth and pointed out in the accompanying specification.

In the accompanying drawings,

Figure 1 is a vertical transverse sectional view through the carburetor,

Figure 2 is a horizontal sectional view on line 2-2 Figure 1, and

Figure 3 is an enlarged top plan view of the tube employed for controlling the speed of the engine when running idle or ata low s eed.

Re erring to the drawings, l indicates the `bowl portion of the carburetor and 2 indicates the dome therefor, the bowl 1 having an air passage 3, one end of which extends through the wall of the bowl .and the Vopposite end formed into a vertically extending collar 4. The dome 2 is also provided with a collar 5, and thedome and bowlA are connected together byreans of a tube 6, the opposed ends ofwwhich are threaded into the collarsk 4 and respectively.

The wall of the tube 6 is provided 'with Series of ports or'openings 7y through which vaporized fuel passes'A from the interior of the dome 2 into the tube 6 where .it is com# u mingled with-air entering through the air passage 3 and fuel entering the tube y 6 through a nozzle 8. v

For controlling the' passage of the air from the airpassage 3 into the tube 6, a venturi 9 is mounted within the tube 6 andis vertically movable therein, the venturi being automatically elevated co-incident to the de ree of vacuum created by the engine to which .the carburetor is attached, and by providing the ports 7 for the vaporized fuel 1n series the. venturi will gradually close the ports 7 as the venturi ascends in the tube 6 thereby limiting the amount of vaporized fuel entering the tube for maintaining the fuel at the proper richness.

Surrounding the discharge end of the nozzle 8 'is a secondary tube 10, the lower end' of which is threaded onto the nozzle 8 and is spaced from that part of the nozzle entering the tube to provide an air chamber- 11, the wall of the tube 10fat' a point below the discharge end of the nozzle 8 having openings 12 therethrough for the admission of air. The tube 10 1s provided adjacent its upper endvwith a head 18, the upper face of which is shaped to fit withln the lower end of the venturi 9, so that when said venturi is in a lowered position, as when the engine is idlin or running at low s eed, the venturi an head will act as a va ve vfor cutting olf the major portion of the supply of air through the air passa however, tovadmit a imited amount of air through the venturi at all times, and for this purpose the peri heral edge of the head 13 is provided wit vertically' extending channels 14 which are so located that Ythe venturi will not close them when seated on 3. It is preferable,

channels 14 serve as slotsU for engagement v with a Spanner wrench, or tool of any class, as when the tube 10 is being attached to or removed from the nozzle 8. The lower end of the nozzle 8 is threaded through an opening in the wall of the air passage 3,' rand has communication with the fuel chamber in the bowl 1, a needle valve 15 being employed for controlling the passage of the fuel through the nozzle, the vlower end of the valve `15 being projected through the 4 wall of the bowl 1 so that the needle may be readily carburetor.

.The upwardv movement of the venturi 9. may be limited by any suitable means, A"but preferabl by introducing a pin I16 transversely t ough the tube 6 at a distance above the normal position ofthe venturi when closed, and the downward movement adjusted from the exterior of the of the venturi mayl also be regulated for controlling its position relative to the head 13 b meaiis of an adjusting rod 17, sald rod being threaded through a bearing 18 formed between the inner wall of the bowl 1 and the outerv wall of the air passage 3. For convenience of adjusting lthe rod the lower end thereof is projected adistance exteriorly of the bowl so that it ma be readily operated from the exterior o the carburetor, and it will readily be seen that by rotating the `rod 17 so as to cause the same to move upwardly the venturi may be raised od the head 13 for increasingv the volume of air passing between the head and the venturi when the venturi is in closed position, and by properly adjusting the rod 17 the volume of air may be readily 1ncreased or decreased. After the rod 17 has been properly adjusted it is held,` in. its adjusted position by providing amilled head or button 19 at the outer end of the rod with which engages a spring clip -20 for holding the head and rod against casual rotation. f

As is commonin carburetors of this class, a ioat 21 is pivotally mounted within the fuel chamber of the bowl 1, which float controls the admission of fuel into the bowl and in the event of an increase of vacuum within the upper portion or dome of the carburetor it sometimes happens that the `float will not act with sufficient rapidity to prevent an over supply of fuel being drawn into the fuel chamber, and to overcome this objectionable feature andat the same time a -tate and laerate the .fuely a by-pass 22 isv formed through the Wall of the bowl 1 and through a web 23 interiorly of the bowl, the inner end of the `by-pass being positioned in line beneath the float 21 sothat the air passing through the by-pass will strike the float and cause the same to more rapidly elevate for cutting off the supply of fuel entering the bowl. The opposite end of the by-pass terminates exteriorly of the bowl 1 and' is interiorly threaded to receive a regulating cap 24 and by'adjusting said cap vertically the volume of air entering the by-pass may be increased or decreased. l

With `the* present device, when the throttle of the engine is open and the engine started,

the vacuum created in the ,dome portion of' the carburetor will lautomatically 4lift the lventuri and move the same away from the head 13, the degree o`f upward movement of the venturil depending entirely l upon f the degree of vacuum created in the ,dome

Having thus fully described my said in' as new anddesire.'

vention, what I claim to secureby .Letters Patent, is:

1. In a carburetor, a fuel chamber, an air passage extending through the chamber, a nozzle inthe air passage,

connect a passage from the.

passages in the wall of the mixing chamber.

connecting it with the fuel chamber above the fuel level, said passage being controlled by saidventuri, means Vfor adjusting the venturi axially, and means for limiting the up` for controlling ,the

ward movement thereof, substantially as set j forth. A

2. 1n a carburetor, a fuel chamber, an air passage extending through the chamber, a nozzle in the air pass age,.a passage from the fuel chamber through the nozzle, a venturi at the upper end of the nozzle freely movable in the space between the nozzle and the wall of the air passage for controlling the passage of air through said air passage, a head about the nozzle having a. seat for the venturi, air passages at regular intervals about the periphery of the head leading past said venturi, air 'passages extending through the head to the nozzle below said seat, a mixing chamber above the nozzle, 4passages in the wall of the mixing chamber connectin it with the fuel chamber above the fuel leve said passage being controlled by said venturi, and means for adjusting the venturi axially, substantially as set forth.

3. In a carburetor, a fuel chamber, an airv head about vthe nozzle having a seat for the` venturi, air passages at regular intervals about the periphery of the head leading past said venturi, e air passages extendin through the head to the nozzle below sai seat, a mixin chamber above the nozzle, and passagesin t e' wall ofthe mixing chamber it with thg-fuel chamber above the fue 'vel said passage being controlled bylsaid venturi, substantially as set forth.

4i. A vcharge forming device compris/ing a fuel chamber, an air passage leading to an internal combustion .engine and .having passages forming communication with the fuel chamber above the level of the fuel, a spray for admitting air beneath the level of the fuel Ain said fuel chamber,- said air passage and passages forming communication with the fuel hamberabove the level of the fuel nozzle extending into said air passage, means'` for admitting air into the being open at all times to the suction of the engine, and a. slidable venturi for artially closing said passages and for contro ing the passage of air through said air passages, substantially as set forth.

5. A carburetor comprising a fuel chamber, means for maintaining the same partially filled with fuel, an air passage asso- ,ciated with the fuel' chamber means for spraying fuel into said air passage, a passage for admitting air into the fuel chamber below -the fuel level, means forming communication between the fuel chamber above the fuel level 'and the first mentioned air passage anda slidable venturi for controlling the air through vthe first mentioned air passage and through said communicating means, substantially as set forth.

6. The combination in a carburetor of a fuel chamber, a float for -maintaining fuel in said chamber at a substantially constant level, a primary air passage associated with the fuel chamber, a secondary air passage,

means Yfor spraying fuel from the fuel chamber into the primary air passa e, a assage uel c amber below the fuel level, communicating means between the fuel chamber above the fuel level and the secondar air passage, a movable venturi for regulating the amount of air through the secondary air passage and through the communicating means, substantially as set forth.

7. he combination in 'a carburetor of a fuel chamber, a float for maintaining said chamber partially filled with fuel an air passage, .means for spraying fuel from'the fuel chamber into the air passage, a submerged blast, communicatingA passages between the fuel chamber above the level of the fuel and the air passage whereby atomized fuel ma pass d1rectly from the upper portion of t e fuel chamber directly into the air passage and a slidable venturi for controlling the passage of air through the air passage and from the upper portion ofl the fuel chamber into saidvair passage, `suby stantially as set forth.

lIn Witness whereof, I have hereunto set my hand at Indiampolis, Indiana, this 13th day of August, A. nineteen hundred and twenty-one.

ALBERT E. WEAVER. 

